Bracelet Size (mm): About 255mm * 20mm * 2.3mm Product Net Weight (g): About 45g Main display: 1.3 "TFT 240 * 240 Battery Type: Li-ion Battery Battery capacity: 170mAh Standby time: about 5-7 days Normal usage time: about 3-5 days Charging time: about 2 hours Warning Type: Vibration Function: Step Counter: Support Time format selection 24 h 12 h: Support Calories: Support Sleep Monitor: Support Heart Rate: Support Alarm: Support Continuous Heart Rate Monitoring: Support Sedentary Reminder Function: Support Blood Pressure: Support Stopwatch: Support Sports Mode: Support Find a bracelet: Support User Interface Selection: Support Music Management: Support “Call, SMS, WeChat, QQ, skype, whatsapp, facebook, linkedin, twitter, viber, line alert”: Support Shaking Photos: Support “Do Not Disturb” mode (22: 00-8: 00 the bracelet will stop receiving notifications, the function of the bright screen to raise your hand has no effect) ”: Support Find phone: support Factory Restore: Support